US4150379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matched filter target acquisition radiometric system
Assignee: SP-MICROWAVE Inc
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Filing: 1977-06-09
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Granted: 1979-04-17
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Expires: 1997-06-09
Abstract
Abstract The matched filter target acquisition radiometric system employs a composite scanning system in searching, acquiring, and tracking relatively small targets on a background of large-magnitude, widely-fluctuating-noise generating terrain. Search for a target is accomplished by a combined circular and conical scan antenna system that generates characteristic invariant wave forms when the circularly symmetric antenna pattern sweeps across a target, patterns that are readily recognized by a matched filter signal processing system, thereupon shifting operation of the antenna control system to a conical scan automatic tracking mode.
Inventors
- 👤 Joseph L. Connors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:30
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/41; G01S7/414; G01S3/00; G01S3/02; G01S3/14; G01S3/56
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
149 words
In a high frequency target detector system: directive antenna means for providing a circularly symmetric antenna receptivity pattern with a directive axis, composite antenna control means for causing said antenna receptivity pattern cyclically to execute a conical scan pattern about a circular path, signal generator means cooperative with said directive antenna means for generating first and second sets of signals representative of the instantaneous angular positions of said antenna receptivity pattern with respect to said conical scan pattern and with respect to said circular path, respectively, receiver means responsive to said antenna means, signal processor means responsive to said first and second sets of signals and to said receiver means when said target lies within said antenna receptivity pattern for yielding at least one invariant output wave, recognition means responsive to said one invariant output wave for generating a recognition signal, and utilization means responsive to said recognition signal.
Claim 2
Dependent Claim
149 words
In a high frequency target detector system: directive antenna means for providing a circularly symmetric antenna receptivity pattern with a directive axis, composite antenna control means for causing said antenna receptivity pattern cyclically to execute a conical scan pattern about a circular path, signal generator means cooperative with said directive antenna means for generating first and second sets of signals representative of the instantaneous angular positions of said antenna receptivity pattern with respect to said conical scan pattern and with respect to said circular path, respectively, receiver means responsive to said antenna means, signal processor means responsive to said first and second sets of signals and to said receiver means when said target lies within said antenna receptivity pattern for yielding at least one invariant output wave, recognition means responsive to said one invariant output wave for generating a recognition signal, and utilization means responsive to said recognition signal.
Claim 3
Dependent Claim
57 words
Apparatus as described in claim 1 wherein said composite antenna control means comprises: first control means for conically scanning said antenna receptivity pattern about a conical scan axis with respect to a first reference direction, and second control means for cyclically moving said conical scan axis along said circular path with respect to a second reference direction.
Claim 4
Dependent Claim
81 words
Apparatus as described in claim 2 wherein said signal generation means comprises: first positional reference means for generating respective signals representative of sin θ and cos θ, where θ is the instantaneous angle between said first reference direction and the instantaneous conical scan angular position of said directive axis, and second positional reference means for generating respective signals representative of sin φ and cos φ where φ is the instantaneous angle between said second reference direction and said conical scan axis.
Claim 5
Dependent Claim
23 words
Apparatus as described in claim 3 wherein said signal processor means includes first computer means for computing a signal representative of cos (θ-φ).
Claim 6
Dependent Claim
19 words
Apparatus as described in claim 4 additionally including second computer means for computing a signal representative of sin (θ-φ).
Claim 7
Dependent Claim
54 words
Apparatus as described in claim 4 wherein said first computer means comprises: first multiplier means responsive to said signals representative of cos θ and cos φ, second multiplier means responsive to said signals representative of sin θ and sin φ, and summation means for summing the outputs of said first and second multiplier means.
Claim 8
Dependent Claim
57 words
Apparatus as described in claim 5 wherein said second computer means comprises: first multiplier means responsive to said signals representative of sin θ and cos φ, second multiplier means responsive to said signals representative of cos θ and sin φ, and summation means for subtracting the output of said second multiplier means from said first multiplier means.
Claim 9
Dependent Claim
45 words
Apparatus as described in claim 5 wherein said signal processor means additionally includes tangent demodulator means responsive to said signal representative of cos (θ-φ) and additionally responsive to said receiver means for producing at least one of a first plurality of invariant form wave outputs.
Claim 10
Dependent Claim
45 words
Apparatus as described in claim 8 wherein said signal processor means additionally includes radial demodulator means responsive to said signal representative of sin (θ-φ) and additionally responsive to said receiver means for producing at least one of a second plurality of invariant form wave outputs.
Claim 11
Dependent Claim
89 words
Apparatus as described in claim 9 wherein said recognition means includes: at least a first matched filter means responsive to said tangent demodulator means for supplying an output signal when said one of a first plurality of invariant form wave outputs matches the characteristic of said first matched filter means, and at least a second matched filter means responsive to said radial demodulator means for supplying an output when said one of said second plurality of invariant wave form outputs matches the characteristic of said second matched filter means.
Claim 12
Dependent Claim
26 words
Apparatus as described in claim 10 wherein said outputs of said first and second matched filter means are coupled through summation means to said utilization means.
Claim 13
Dependent Claim
24 words
Apparatus as described in claim 11 wherein said utilization means comprises means for disabling the circular scan function of said composite antenna control means.
Claim 14
Dependent Claim
24 words
Apparatus as described in claim 12 wherein said utilization means additionally comprises means for enabling automatic tracking function of said composite antenna control means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |